client dockerfile: use wildcard for package.json

app/client/Dockerfile

@@ -4,9 +4,10 @@ FROM node:12.16.3 as build
 RUN mkdir /usr/src/app
 
 WORKDIR /usr/src/app
+
 ENV PATH /usr/src/app/node_modules/.bin:$PATH
 
-COPY package.json /usr/src/app/package.json
+COPY package*.json ./
 
 RUN npm install